Pulverizing mill



May 21, 1929. s DUVALL 1,713,957

PULVERIZING MILL Filed June 20, 1928 /6 0 0 o o g 00o ogo X8? Z5 0 0 0 0 0 0 0 0 0 0 0 o p o o JH'UC'I 1 kn- Z Vail Patented May 21, 1929.

UNITED STATES- 1,113,951 PATENT OFFICE.

SAMUEL DUVALL, OF CHICAGO, ILLINOIS.

runvnm zmo MILL- Application filed June 20,

a device of this character, and of the rotarybeater type, wherein the heaters are so arranged that the pulverizing action, upon the material, is more efiicient, and wherein such material is properly acted upon by all of the hammers of the beater.

Another object is to provide a rotary beater wherein the hammers are' arranged in groups, and such groups arranged in staggered relation to the adjacent groups, whereby the hammers of one group attack the material, and then suchmaterial is attacked by the next adjacent staggered group.

Another object is to'provide a novel and efficient means, arranged between the sets of hammer groups, which are arranged to move the material toward one group, and

then toward the other group, with the result that the material is properly pulverlzed to the desired degree. 1

Other. objects and advantages will be apparent from the followingdescription when taken in connection with the accompanying drawing.

In the drawing:

Figure 1.is a vertical transverse sectional view, through a mill made in accordance with the present invention.

Figure 2 is a vertical longitudinal central sectional view, on the line 2-2 of Fi ure 1. "3 Figure 3 is a detail v'ew showing t ema-.

terial propellers 27 and) 28.

Referring particularly to the accompanying drawings, 10 represents a cylindrical casing, which is properly supported on the legs 11, and having a feed opening 12 in one side, and a hinged cover 13, on its upper side. Extending longitudinally within the casing, and having its ends journaled in the end walls of the casing, is a shaft 14. Fixed on the end portions of theshaft, within the casing, are the disks or plates 15 and 16, respectlvely, and, fixed on the intermediate portion of the shaft is a disk or plate 17. The disks or plates 15 and 16 are formed with the radial arms 18, each having an o ning 19 in its outer end. In the central disk 17, in alinement, respectively with the openings of the end plates, are openings 20. It will be particularl noted that the openings 20, of the disk 1 which aline with the openings 19, of the disk or plate 15, are stag- 1928. Serial No. 286,790.

gered with relation to the openings which' aline with those of the other plate 16. Secured within the openings 20 of the disk 17 and extending toward theopposite ends of the casing, in alternate succession, are the rods or shafts 21 and 22, the former having their other ends secured within the openings of the plate 15, while the latter have their other ends secured within the openings of the plate 16. Loosely mounted on the rods orshafts 21 are the radiall extending arms or hammers 23, 'while simi a'r arms or hammers 24 are mounted on the rods or shafts 22. Suitable spacing washers 25 are disposed between the-hammers 23, on the rods or shafts 21, while similar spacing washers 26 are disposed on the rods or shafts 22; between the hammers Secured to. the central disk 17, and extending ,radially therefrom, at,two diametrically opposite points, are the material propeller arms'27 and 28, the former of which has, its outer end slightly curved transversely, and twisted out of the plane of the remainder or body por- ,tion thereof, while the latter has its outer end similarly formed, but. twisted in the opposite direction to that of the first arm. These arms are' a'rranged to successivel engagethe material operated upon by the ammer arms, to'move such material toward one end of the casing, to be acted upon by the hammers 23 in one instance, and toward the other end of the casing, to be acted upon by the hammers 24, in the second instance, wit the result that such material will be in constant motion, longitudinally of the casing, to be thoroughly pulverized.

The bottom of the casing-is removed, and removably secured therein is a downwardly bowed, longitudinally extending screen 29, through which I the pulverized material passes, after being roperly acted upon by the hammers 23 an 24.

One end of the shaft 14 is provided with a pulley 30, to receive power from an suitable source, for rotating the shaft, w ereby to cause the hammers to act upon the material.

In the drawings a feed ho per 31 is removabl connected in the fee 0 ening, but 106 it will e understood that a feed table ma be readily substituted therefor, in accor ance with the conditions, or the desire of the user.

Removably secured to the inner faces of. 110 the casing and the cover thereof, are the lining sections 31, which are preferably formed from metal, and serve to protect the casing from damage by the material being ground.

What is claimed is:

1. A pulverizing mill including a casing 6 and .a="shaft mounted therein, staggered groups" of hammers mounted on the shaft, and radially extending arms arranged to force the material alternately toward the opposite ends of the casing for crushing action by the staggered groups of hammers.

2. A; pulverizing mill including a casing and a shaft. mounted therein, staggered groups of hammers mounted on the shaft,

and a plurality of radially extending oppositely twisted arms disposed between the groups of hammers for successively and alternately propelling the material from one end of the casing to the other end thereof for alternate and successive action by the hammer groups. I

In testimony whereof, I aflix my si nature.

SAMUEL D ALL. 

